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Low-density and low-heat-conduction-rate polyurethane foam and preparation method thereof

A technology of polyurethane foam and low thermal conductivity, applied in the field of materials, can solve the problems of unfriendly polyurethane foam, high GWP value, low thermal conductivity, etc., and achieve good compressive strength and dimensional stability, uniform density distribution, and low gas-phase thermal conductivity. Effect

Active Publication Date: 2017-03-15
HEFEI HUALING CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems of non-environmental protection and high GWP value of polyurethane foam prepared by using hydrochlorofluorocarbon blowing agent in the prior art, and meet the new energy efficiency standard of the national household appliance industry in 2016, the present invention provides an environmentally friendly polyurethane foam with low thermal conductivity. A kind of low density, low thermal conductivity polyurethane foam and its preparation method

Method used

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  • Low-density and low-heat-conduction-rate polyurethane foam and preparation method thereof
  • Low-density and low-heat-conduction-rate polyurethane foam and preparation method thereof
  • Low-density and low-heat-conduction-rate polyurethane foam and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0055] In Examples 1-3, changing the components of the CP / LBA / HFC-134a mixed blowing agent can prepare polyurethane foams with low density and low thermal conductivity, see Table 1 for details, wherein, the preparation method of the polyurethane foams Include the following steps:

[0056] Table 1 implements the raw material components and content of 1-3 and comparative example 1-2

[0057]

[0058]

[0059] 1) Add the weighed polyol composition into the mixing tank, add the weighed composite catalyst, foam stabilizer and water, pressurize to 0.5-1.5MPa at 25±5°C for physical mixing, and stir for 0.5-1.5 hours, the primary mixture was obtained;

[0060] 2) Using multi-stage static premixing equipment, mix LBA and HFC-134a with the above-mentioned primary mixture at a pressure of 0.7-2.0 MPa for 0.5-1.5 hours, then add cyclopentane and carry out secondary mixing under a pressure of 2.0-4.0 MPa. Grade mixing to obtain a pre-mixture;

[0061] 3) The organic polyisocyanate...

Embodiment 2

[0072] Compared with the foam of Comparative Example 1 in Example 2, it can be seen that the former foam has better fluidity, the molded core density is reduced by 19.9%, the thermal conductivity is reduced by 8.4%, the minimum filling weight is reduced by 19.2%, the expansibility is reduced, and the exfoliation is reduced. The modulus performance is improved.

[0073] Compared with Comparative Example 2, the thermal conductivity and expansion rate of Example 2 are close, the molded core density has decreased by 9.6% compared with Comparative Example 2, and the minimum filling weight has decreased by 9.5%. The foaming material of the product prepared by using this foam The consumption is reduced, the cost is reduced, and the blowing agent consumption of Example 2 is less than that of Comparative Example 2, and the cost is low, which further reduces the production cost.

[0074] In Examples 4-8, by changing the ratio of blowing agents cyclopentane, LBA, HFC-134a and choosing cy...

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Abstract

The invention relates to low-density and low-heat-conduction-rate polyurethane foam and a preparation method thereof. The polyurethane foam is prepared from the following raw materials in parts by weight: 100 parts of a polyatomic alcohol composition, 1 to 30 parts of a low-gas-phase heat conductivity coefficient foaming agent, 0.5 to 6 parts of HFC-134a, 5 to 20 parts of pentane, 0.5 to 3.0 parts of water, 1.0 to 3.5 parts of a catalyst and 1.0 to 4.0 parts of a foam stabilizer, wherein the ratio of the use amount of organic polyisocyanate to the total mass of the raw materials is 1.15 to 1.35. The polyurethane foam prepared by the method has a low GWP value; when the polyurethane foam is used, gas which damages an ozone layer is not released; the molding density of the foam is low and is reduced by 19 percent or more when being compared with that of a common cyclopentane system; the polyurethane foam is good in dimensional stability and low in heat conduction coefficient; the total weight of a product can be reduced and the comprehensive cost is low; the polyurethane foam has extremely good economic benefits in a heat preservation industry of high-end products.

Description

technical field [0001] The invention relates to a polyurethane foam with low density and low thermal conductivity and a preparation method thereof, belonging to the field of material technology. Background technique [0002] Rigid polyurethane foam has good thermal insulation properties, so it is used in different thermal insulation fields. As we all know, the thermal insulation of rigid polyurethane foam is an important factor affecting the energy consumption of products, and the low thermal conductivity of foam is an important indicator of good thermal insulation. The thermal conductivity of rigid polyurethane foam depends to a large extent on the type of blowing agent used. The blowing agent is affected by heat in the foam to form a blowing gas that is encapsulated or trapped in the closed-cell structure of the foam and is often the primary contributor to the thermal conductivity properties of rigid polyurethane foam. After foam formation, the thermal conductivity assoc...

Claims

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Application Information

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IPC IPC(8): C08G18/50C08G18/48C08G18/42C08J9/14C08J9/08C08G101/00
CPCC08G18/4018C08G18/4208C08G18/4804C08G18/4883C08G18/5027C08J9/08C08J9/141C08J9/144C08J9/146C08J9/149C08J2203/10C08J2203/14C08J2203/142C08J2375/08C08G2110/005
Inventor 赵士虎袁海霞张可可汪磊王彪
Owner HEFEI HUALING CO LTD
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